feat/#375: Quasar Upgrade
This MR provides…
Quasar ^1.15.1 -> ^2.6.0
Vue -> ^3.0.0
VueX -> ^4.0.1
Noticed 2 bugs with the upgrade:
Tree click event of the title doesn't collapse/open the tree structure, works only when click on the arrow. (WIP)
Scroll behaviour in Text and Annotation panel.